Support LLM gateway with Dyad API key (#23)

* Do not make API key input (password) - hurts usability
* Support LLM gateway (and add GPT 4.1 mini model)
* Show Dyad Pro button
* Fix to use auto (not dyad) for detecting dyad pro
* Fix description of gpt 4.1-mini

src/components/settings/ProviderSettingsPage.tsx

@@ -273,7 +273,6 @@ export function ProviderSettingsPage({ provider }: ProviderSettingsPageProps) {
                   </label>
                   <div className="flex items-start space-x-2">
                     <Input
-                      type="password"
                       id="apiKeyInput"
                       value={apiKeyInput}
                       onChange={(e) => setApiKeyInput(e.target.value)}